Regaños is the plural of "regaño," coming from the verb regañar (to scold).
In the line "Gracias a pai y a mami por to' los regaños," Bad Bunny thanks his parents for every telling-off that molded his character. It’s a colorful, less-common noun that learners rarely see in songs, making it both useful and memorable.
In "<3", Bad Bunny is taking a victory lap, but he's also looking back at where he came from. He starts by giving a huge shout-out to everyone who supported him from the very beginning, even before he was famous: "Gracias a to' el que creyó en mí, desde el primer día" (Thanks to everyone who believed in me, from the first day). He dedicates all his success to his fans, especially those in Puerto Rico and the Dominican Republic. He's not shy about his achievements, either. He calls himself "el mejor en esto" (the best at this) and compares his consistent success to LeBron James's talent. He even casually mentions seeing LeBron and talking to wrestler Triple H, showing just how big his world has become.
But it's not all celebration. Bad Bunny also gets real about the downside of being a superstar. He admits that even with all the success, he can end up "en mi casa solo y aburrido" (at home alone and bored). He even says the fame has made him sick: "esto de la fama me tiene hasta enfermo" (this fame thing even has me sick). The song ends with him thanking his parents for keeping him grounded and remembering how their discipline made him the person he is today. It's a powerful mix of gratitude, massive confidence, and a surprisingly honest look at the loneliness that can come with being at the top.